# PushBack Definition<no value>
 

There are actually two types of pushback vehicles: the **regular Pushback**, and the **SmallPushback**. The former is used to push back large aircraft, generally airliners, while the latter is aimed for smaller aircraft, usually jets as well as small GA aircrafts. Both behave the same way in the end, from a behavior and general configuration perspective.

{{< image-center
    src="images/5_Content_Config/SimObj/vehicles/pushback_large.png"
    alt="A Pushback Pushing An A320Neo" >}}

{{< image-center
    src="images/5_Content_Config/SimObj/vehicles/pushback_small.png"
    alt="A Small Pushback Pushing A Cessna 172 SkyHawk" >}}

 

### Model Notes

Contrary to all other types of Ground Vehicles, the Pushback (and SmallPushback) **must have its origin position located in the place where the wheel of the aircraft will attach**, and *not* the center of the vehicle. And by "origin position", we mean the point of coordinates (0,0,0) in the scene when exporting the `glTF` file of the vehicle.

 

Moreover, the "front" of the Pushback must be the part closest to the aircraft when attached, and the "back" of the Pushback being the side farthest away from the attach point. In other words, the Pushback will move *forward* when pushing an aircraft, and *backwards* when detaching from the aircraft.

 

 

### Sim.cfg

Except for the origin position, and the possible confusion of "which side is the front ?", Pushback vehicles have the same configuration as regular [Ground Vehicles](../ground-vehicles/).

 

 

### Model Behavior Helper

And additional model behavior helper is available for Pushbacks with an include of "Asobo\_Misc.xml": `ASOBO_Pushback_Attach`. This template takes two parameters, `ANIM_NAME` and `PERCENT_PER_SECOND`, and plays the corresponding animation when the pushback attach itself to the aircraft, and plays this animation backwards when the pushback detach itself. `PERCENT_PER_SECOND` determines the speed of the animation. We recommend using a short animation (if any), as the Pushback will not wait for the end of this animation to start moving after attaching or detaching itself.